// parseDSA parses DSA public key material from the given Reader. See RFC 4880,
// section 5.5.2.
func (pk *PublicKey) parseDSA(r io.Reader) (err error) {
pk.p.bytes, pk.p.bitLength, err = readMPI(r)
if err != nil {
return
}
pk.q.bytes, pk.q.bitLength, err = readMPI(r)
if err != nil {
return
}
pk.g.bytes, pk.g.bitLength, err = readMPI(r)
if err != nil {
return
}
pk.y.bytes, pk.y.bitLength, err = readMPI(r)
if err != nil {
return
}
dsa := new(dsa.PublicKey)
dsa.P = new(big.Int).SetBytes(pk.p.bytes)
dsa.Q = new(big.Int).SetBytes(pk.q.bytes)
dsa.G = new(big.Int).SetBytes(pk.g.bytes)
dsa.Y = new(big.Int).SetBytes(pk.y.bytes)
pk.PublicKey = dsa
return
}
func (k *RR_DNSKEY) publicKeyDSA() *dsa.PublicKey {
keybuf, err := packBase64([]byte(k.PublicKey))
if err != nil {
return nil
}
if len(keybuf) < 22 { // TODO: check
return nil
}
t := int(keybuf[0])
size := 64 + t*8
pubkey := new(dsa.PublicKey)
pubkey.Parameters.Q = big.NewInt(0)
pubkey.Parameters.Q.SetBytes(keybuf[1:21]) // +/- 1 ?
pubkey.Parameters.P = big.NewInt(0)
pubkey.Parameters.P.SetBytes(keybuf[22 : 22+size])
pubkey.Parameters.G = big.NewInt(0)
pubkey.Parameters.G.SetBytes(keybuf[22+size+1 : 22+size*2])
pubkey.Y = big.NewInt(0)
pubkey.Y.SetBytes(keybuf[22+size*2+1 : 22+size*3])
return pubkey
}
func (k *DNSKEY) publicKeyDSA() *dsa.PublicKey {
keybuf, err := fromBase64([]byte(k.PublicKey))
if err != nil {
return nil
}
if len(keybuf) < 22 {
return nil
}
t, keybuf := int(keybuf[0]), keybuf[1:]
size := 64 + t*8
q, keybuf := keybuf[:20], keybuf[20:]
if len(keybuf) != 3*size {
return nil
}
p, keybuf := keybuf[:size], keybuf[size:]
g, y := keybuf[:size], keybuf[size:]
pubkey := new(dsa.PublicKey)
pubkey.Parameters.Q = big.NewInt(0).SetBytes(q)
pubkey.Parameters.P = big.NewInt(0).SetBytes(p)
pubkey.Parameters.G = big.NewInt(0).SetBytes(g)
pubkey.Y = big.NewInt(0).SetBytes(y)
return pubkey
}
